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Annotation of 43BSDReno/sys/net/if_arp.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)if_arp.h    7.4 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: /*
        !            24:  * Address Resolution Protocol.
        !            25:  *
        !            26:  * See RFC 826 for protocol description.  ARP packets are variable
        !            27:  * in size; the arphdr structure defines the fixed-length portion.
        !            28:  * Protocol type values are the same as those for 10 Mb/s Ethernet.
        !            29:  * It is followed by the variable-sized fields ar_sha, arp_spa,
        !            30:  * arp_tha and arp_tpa in that order, according to the lengths
        !            31:  * specified.  Field names used correspond to RFC 826.
        !            32:  */
        !            33: struct arphdr {
        !            34:        u_short ar_hrd;         /* format of hardware address */
        !            35: #define ARPHRD_ETHER   1       /* ethernet hardware address */
        !            36:        u_short ar_pro;         /* format of protocol address */
        !            37:        u_char  ar_hln;         /* length of hardware address */
        !            38:        u_char  ar_pln;         /* length of protocol address */
        !            39:        u_short ar_op;          /* one of: */
        !            40: #define        ARPOP_REQUEST   1       /* request to resolve address */
        !            41: #define        ARPOP_REPLY     2       /* response to previous request */
        !            42: /*
        !            43:  * The remaining fields are variable in size,
        !            44:  * according to the sizes above.
        !            45:  */
        !            46: /*     u_char  ar_sha[];       /* sender hardware address */
        !            47: /*     u_char  ar_spa[];       /* sender protocol address */
        !            48: /*     u_char  ar_tha[];       /* target hardware address */
        !            49: /*     u_char  ar_tpa[];       /* target protocol address */
        !            50: };
        !            51: 
        !            52: /*
        !            53:  * ARP ioctl request
        !            54:  */
        !            55: struct arpreq {
        !            56:        struct  sockaddr arp_pa;                /* protocol address */
        !            57:        struct  sockaddr arp_ha;                /* hardware address */
        !            58:        int     arp_flags;                      /* flags */
        !            59: };
        !            60: /*  arp_flags and at_flags field values */
        !            61: #define        ATF_INUSE       0x01    /* entry in use */
        !            62: #define ATF_COM                0x02    /* completed entry (enaddr valid) */
        !            63: #define        ATF_PERM        0x04    /* permanent entry */
        !            64: #define        ATF_PUBL        0x08    /* publish entry (respond for other host) */
        !            65: #define        ATF_USETRAILERS 0x10    /* has requested trailers */

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